US PATENT SUBCLASS 212 / 173
.~ Variable speed transmission

Current as of: June, 1999
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212 /   HD   TRAVERSING HOISTS

170  DF  HAVING CLUTCH OR VARIABLE SPEED TRANSMISSION {4}
173.~ Variable speed transmission

DEFINITION

Classification: 212/173

Variable speed transmission:

(under subclass 170) Apparatus including means to vary the ratio of the speed at the output of a motor to the speed at which a load moving mechanism is driven by the motor.

SEE OR SEARCH CLASS

254, Implements or Apparatus for Applying Pushing or Pulling Force,

187.6, for hoisting drums having a variable speed drive.